Moisture-proof paper-stock and method of producing.



PAPER PPLICATI Patented Oct. 31, 1916.

ammtoz m 622 Mx/W UNITED STATES PATENT onnion.

CHARLES A. BICKETT, 0F CIfNCINNATI, OHIO.

. MOISTURE-PROOF PAiER-STOCK AND METHOD OF PRODUCING.

To all whom it may concern Be it known that I, CHARLES A. Bronnrr, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and- State of-Ohio, have invented certain new and useful Improvements in Moisture-Proof Paper-Stock and Methods of Producing, of which the following is a specification.

My invention relates to improvements in water or moisture proof paper stock and method of producing the same.

One of its objects is to provide a paper stock which is water or moisture proof and which is adapted to receive printing on one side.

Another object is to provide a stock which may be produced from either heavy strong paper stock or light thin paper stock moisture proofed on one side.

Another object is to provide an improved method of producing stock from a single sheet of material so that all or any desired portion of one surface maybe coated with moisture proof material while the other face will be free from injury. to its appearance or printing properties from the application of p the moisture proof material.

Another object is to prevent the moisture proofing material penetrating deeplyinto or through the texture, of the paper stock, thereby securing a thin but dense and impervious coating of moisture proof material.

Another object is to provide for applying the moisture proofing material to certain portions only of one face of the stock, leaving other portions of thesame face free to receive adhesive material or to be acted upon by adhesive material in setting up paper containers.

My invention also comprises certain de tails of form, combination and arrangement, and order of procedure, all of which will be fully set forth in the description of the-accompanying drawings, in which:

Figure l is a diagram illustrating the mechanism and method of coating or applying moisture proof material to a sheet of aper stock. Fig. 2 is an enlarged sectional detail through my improved stock. Fig. 3 is an inside plan view of a blank for a paper container, and illustrating one of the applications of my invention.

My invention is designed to produce a paper stock for the manufacture of paper'containers such as paper" sacks, envelops, pouches and boxes in which the stock is moisture proof, on one face while the oppo-- Specification of Letters Patent.

. side.

Application filed April 1, 1915. Serial No. 18,588. v

site face is unaffected by moisture proof material and is free to receive printing, or adhesive materials. It is also esigned to provide paper stock to which the m ture proofing material is applied locally to portions only of one face of the stock leaving other portions uncoated to provide laps or joints to be united by adhesive material.

The moisture proofing material most suitableand the one preferably employed is parothers may be employed if desired. In order to apply the moisture proofing material to one face of the sheet and prevent it from penetrating through to the opposite face of the sheet, or to prevent it from penetrating'too deeply into the fiber of the sheet I apply the heated or fluid paraffin to one face of the sheet and substan-.

tially at the same time apply a liquid to the writing opposite face of the sheet which is immiscible with the para-fiin, and whichpenetrates from one side into the body of the sheet at substantially the same time that the paraflin penetrates into the sheet from the opposite Thus the two materials as they penctrate into the body of the sheet, being immiscible one with the other, each constitutes a barrier, where they meet in the body of the sheet, to the further penetration of the other. Water Will serve and is preferably employed as the liquid to be applied to the opposite face of the sheet. 'The water is preferably heated so as not to have too great a chilling effect upon the paraffin, but the temperature of the water may be varied depending upon the weather and other conditions. After the two substances have met in the interior of the sheet and have respectively barred the enetrating progress of the other, the para 11 commences to cool and assumes a solid or semi-solid condition while the water quickly vaporizesand disappears leaving the paper stock coated with moisture proof material upon one side o1 aly.

In Fig. -1, I have illustrated one form of apparatus to carry out the process and produce my improved paper stock. -A represents a sheet or roll of paper to be treated. B represents a bath containing moisture proofing material preferably paraffin having a heating jacket 2 and pipes 3 and 4 to lOu cible with the moisture proofingmaterial, preferably water or a. sizing. 5 represents a jacket by means of which the bath C may from the jacket 5.

A roller D dips into the bath B and in turn distributes moisture proofing-material from the bath to a roller E in contact with one face of the sheet A. The roll may have a plainor continuous cylindrical face to coat the entire face of the sheet, or it may have recesses 8 in its face so as to leave an uncoated margin along one edge of the sheet, or an uncoated pattern along or across the sheet so that the sheet may be subsequently blanked into box or pouch blanks.

A roller F dips into the bath C and distributes the contents thereof to the face of a roller H which preferably contactswith the opposite face of the sheet at a point substantially opposite the roller E and thus the two materials proceed to penetrate into the body of the sheet from opposite sides at substantially the same time and continue to penetrate until they meet at some point in the interior of the sheet, where each prevents further penetration on the part of the other By various means the penetration of moisture proof material maybe controlled to securea heavy or light coating thereof, as for instance, by regulating the amount *of the .respective materials applied to opposite sides of the sheeti or by applying one materialslightly in a vance of the other, or by applying a size in place of pure water. 'In prac; I tice the moisture proof material instead of penetrating to the opposite faceof the sheet and forming a more or less open-or porous coatingis concentrated into a thinner but dense and impervious coating, and results in a material saving in moisture proof material while securing a more moisture proof product.

After the two materials have been applied to opposite sides of the sheet, the sheet is fed forward a considerable distance to a receiving roll K on which it is wound. The distance between the rolls E H and roll K should be relatively-greater than shown in Fig. 1 and sufiicient to enable the sheet to cool sufliciently for themoisture proof ,ma-

terial to practically solidify, and during 7 hesive material.

In Fig. v3 is illustrated in plan a blank for a moisture proof envelop or pouch, the main portion 14 of one face being coated with moisture proof material, leaving uncoated laps 15 and 16 to receive adhesive material. To produce blanks of this and similar character the roller E is provided with longitudinal or .transverse grooves 8 where the uncoated portions are desired, and each revolution of the roller coats a portion of the sheet suflicient for'one or more blanks. The sheet is subsequently fed to dies which cut out the blanks and score them for folding. Tubes for producing sacks and like articles may be formed by leaving a continuous uncoated margin along one edge of the sheet, which maybe subsequently employed as a glue lap to form the sheet into a tube.

My invention as herein illustrated and stock I for paper containers comprising a plane-faced sheet of paper one of the faces of which is coated with parafiin .which does not penetrate to the opposite face, said opposite face, being in its original cond1t10n to recelve prmtmg or adhesive material.

2. A paper stock for paper containers comprising a plane-faced sheet of paper one face of which is coated with paraffin except where it isdesired to apply an adhesive-material to assemble the container, and in which the paraflincoating doesnot penetrate to the opposite face of the sheet,

" said opposite face being in its original con:

dition to receive printing on'adhesive material.

3. A- stock for paper containers comprising a plane-faced sheet of paper coated on one face with parafiin or like moisture proof material which is limited in its penetration to a fraction ofthe thickness of the sheet ori a1 condition to receive printing or ad- 4. A stock for. paper containers compriswhich has certain portions coated with moisthis period the water is practically alYeva'p-\ ture proof material and other portions free In Fig.2 A represents a section of the sheet in enlarged cross section showing the moisture proof material 12 ashaving penetrated practically half way through the sheet where it has been stopped by the penetration of water or similar immiscible material from the opposite face.

to be acted upon by adhesive material, said moisture proof material being limited in its penetration to a fraction of the thickness of the sheetleaving the opposite face of the leaving the opposite face of the sheet in its.

'- 1'15 ing a plane-,faced-esheetof paper one face of sheet in its original condition to receive printing'or adhesive material.

5. The method of preparing moisture containers which comprises appl ing fluid moisture proof material to one face of a sheet of paper and at substantially the same time applying a fluid immiscible with said proof plane-faced paper stock for paperundisturbed and to remove the fluid immiscible therewith.

7. The method of preparing a moisture proof paper stock which comprises applying moisture proof material to one face of a sheet of paper, at substantially the same time applying a fluid immiscible with said moisture proof material to the opposite face of saidv sheet, and subsequently subjecting the sheet to a drying operation at a temperature lower than the melting point of said moisture proof material.

8. The method of. preparing a-moisture proof paper stock which comprises applying a moisture proof material to certain por tions of one face of a sheet of paper leaving other portions of the same face uncoatedwith moisture proof material, at substan tially the same time applying a fluid immiscible with said moisture proof material to the opposite face of said sheet, and subsequently subjecting the sheet to a drying operation at a temperature lower than the melting point of said moisture proof material.

In testimony whereof I have affixed my signature in presence of two witnesses.

CHARLES A. BICKETT. Witnesses:

C. W. Mums, W. THORNTON BOGERT. 

